Furnace



B. F. CALDWELL.

FURNACE.

APPLICATION FILED APR.2'I, I9I9.

Patented Aug. 3i, 1920.

2 SHEESQSHLE] 2.

iJruTsD STATES AwxrlzNr, OFFICE( :BENJAMIN F. CALDWELL, or roivroNA, CALIFORNIA. i f' '.FURNACE.

To all 'whom it may concern: p

Be it known that I, BENJAMIN F. CALD- WELL, a citizen ofthe United States, residing at Pomona, in the county of Los Angeles and State of California, have iii- V vented new and useful improvements in Furnaces, of which the following is a specification. Y

My invention relatesv to a furnace, and more particularly to a heating furnace vfor vresidences and the like.

An object of my invention is to provide a gas burning heating furnace which mayy be placed in the cellar of afhouse and may be employed to heat its various rooms 't independently.

Another object is to produce a furnace of the character described which is made up of standard heating sections inclosed within an outer casing so that it may be-made in Y various sizes and capacities with little trouble and comparatively small expense.

With t-hese and other objects in View my invention consists of the construction, combination and arrangement of parts herein- Y after described and claimed.

In the accompanying drawings which .form a part of this specification,

vFigure 1 is a fragmentary view of the basement of a house showinga furnace embodying the principles of my linvention placed therein. l

. Fig. 2 is an enlarged horizontal section of the furnace taken on the line 2-2,of Fig. 1.

Fig. 3 is a fragmentary view showing the square ends of the valve rods projecting through the floor of a room above the furnace, as seen in the direction indicated by the arrow.3 in Fig. 1. t l y Fig. 4 is a `central vertical section through the furnace taken on the line 4-'4 of Fig.. 2. Fig. 5 is a diagrammatic view illustrating the method of assembling the` standard heating sections to form; a larger furnace than that shown in the other figures.

.Y Referring to Fig. 1, 10 is a house chimney extending upwardly from the basement fioor 11 through the floor `12 ofthe upper room which is laid on joists'l supported by a cross beam 14, which in lturn is supported by upright'posts 15 resting on the basement floor. .on the basement floor and'has heat conducting pipes 17 extending `from the furnace to lregisters 18 placed in the various rooms of Specification of Letters Patent.

The furnacey 16 also rests .thehouse VA smoke pipe 19 connects the i placed in the frontend of the furnace,y a

standard outlet section 23 lisfplacedkin the 'rear end of the furnace and a'y standard vintermediate section 24 is vplacedfbetween them.` These sections are securely fixed in spaced relation to each otherby'longitudinal top bars 2,5 and bottom bars 26v between PatentedAug. 31, 1920.'

Application filed April 21, 1919. VSerial No. 291,746.

which they are clamped byvertical rods27.

which extend through lugs 28 formed on Vthe heating sections and through said top and bottom bars and have tightening nuts 29 on` their upper ends.

` The burner s ectionis made slightly larger,` `than the outlet section, and consists [of a casing formed of an upper plate 3() and a lower plate`3'1 approximately. semicircular in form between which a Vertical sheet of .metal 32 is clampedA to form the sides. `The edges of this casing sheet restin grooves 30 and 31 formed around the margins of the plates. The upper and lower plates are formed with vertically coincidingholes 3 3 ends fixed. The lower platehas a large circular opening 35v formed at approximately the burner chimney in which a verticalsight tube 37 is fixed.Y This sight tube extends. through `and somewhat above the dome of the outercasing soithat theburnerV may be observed through it fromthe floor above.

The outlet section is similar in form to the burner section,having top and bottoml plates 38 yand 39l with side casing 40 clamped be- '85 in which vertical ue pipes34 have their ico tween them. Similar flue Vpipes 41 have i their ends fixed in holes formed in thetop and bottomy plates. ,The ,intermediatel secf'V tion is formed Vin a manner similarfto vthat Vof the burner and outlet'sections,l but 'has'` Y relatively narrow top. and bottom plates 42 and 43 with straight sides and'rounde'd ends:

having a sheet metal side- 44 clamped between them. A single row of flue pipes 3.4,

Vsimilar to 'thosein the end sections,` are fixed Y in the top and bottomplates'lof the inter,-

Horizontal cross fines 46 and 47 extend between the sections to conduct the products of combustion from section to section proceeding from the burner section to the fine section. These flues are formed of a larger pipe section 48 fixed inone section telescoping over a smaller pipe section 49 fixed in an adjacent section. Provision is thus made for any possible expansion and contraction of the sections of the furnace which might cause variations inthe distances between said sections. VIt will bev observed that the cross flue pipes-46vand 47 areof different size,rand that the larger are placed alternately belowand above the vertical center of the sections, while the smaller cross fines arev placed alternately above and below, so that there is one larger and one smaller cross flue between each adjacent pair of sections. By this arrangement it will be noted that the products of combustion passing through the furnace from one section to the n'eXt will have a tendency to be drawn through the furnace in a sinuous course since the greater draft will be created through the furnace at the ends of adjacent sections having the larger flue connecting the same, and said increased draft being provided between adjacent sections at alternate ends thereof, will cause the greater portion of the products of combustion passing through the furnace to follow the tortuous path of said draft. The heater' sections are held in spaced relation from the furnace floor by the arched opening 51 into the combustion plates. Y

'pipe' 60 leading from the gas main.

four separate burners connected in pairs,

each pair having separate feed pipes 55 and 56 which are connected to a common cross pipe 57, and are controlled by separate supply cocks or valves 58`and 59. The cross pipe 57 is connected to a common supply he burner is also provided with a pilot burner 61 connected to the cross pipe 57 by an independent pipe 62 controlled byan independent supply cock 63. `The' burner thus described'is adapted to be shoved through chamber. This opening serves as an air inlet for air supplied to the burner. The main gas supply cocks of the burner are provided with extension rods 64 which extend upwardly through the floor 12 of the room above and terminate in squared ends 65 adapted to be operated by a key. These rod ends terminate slightly below the floor sur- "face and the holes are equipped with colf lars 66 fixed inthe -iioor. These rods are provided so that gas supply may be regulated from above, thus making it unnecessary to descend to the basement for `that purpose. Small levers 67 and 68 are attached to the rods close to the furnace by means of which the gas supply may be regulated in the basement when starting the furnace. A transparent plate 69 is fixed in the floor 12 of the room above in vertical alinement with the sight pipe 37, so that the burner can be observed from the upper room by looking downward through the floor plate and the sight tube when vregulating the gas. i

In the furnace thus far-described, but one intermediate section-is used with one burner and one outlet section, this provides a relatively small furnace. If it is desired to make a larger one, it is evident, that the burner and outlet sections may be set farther apart and a larger number of intermediate sections placed between them. A suitable outer casing can then be made for the larger furnace thus constructed as illus- Vtrated in Fig. 5. Y Y

The operation of the furnace which is shown in Fig. 4 is asfollows:

The pilot light is originally started by turning on the supply cock 63 and lighting the pilot through the arched opening 51. The burners are then started by turning the main suppl cocks 58 Aand 59 by means of the levers 6 and 68, or by applying the key to the squared ends 65 4of the rods 64. The burner is supplied with air entering the arched opening 51. The burnt gases pass upwardly through the burner chimney 36 and spread within the casing of the burner section passing around and between the lflue pipes 34 andheating them, then passing out of the burner section through the cross flues 46 and 47 to the intermediate section again spreading and passing around the flue pipes in the intermediate section, then passing from the intermediate section through the cross flues 46 and 47 to the outlet section, and again spreading around the vertical flue pipes in this section and finally passing out through the smoke pipe 19. The air sup'- ply for heating the rooms is drawn through a side vdamper 70 in the outer casing 20 of the furnace. It passes upwardlyv between and aroundV the vheating sections `as wellv asY through the vertical Hue pipes 34 and 45 ofthe different sections into the dome 21 of the furnace, andv thence through the various heat conducting pipes 17 to the registers 18 in the different rooms.' The heavier arrows in Fig. 4 indicate the course of the burnt gases through the furnace while the lighter arrows indicate that of the air.

l/Vhile I have shown the preferred construction of my furnace, as now known to me, it will be understood that various changes in construction and combination of parts may be made by those skilled in'the art without departing from the spirit of my invention as claimed.

I claim:

A heating furnace comprising an outer casing, a series of heating chambers mount ed in bodily spaced relation toV each other and to and within the said casing, each of the sections provided with respective top and bottom forming plates and walls arranged onthe respective top and bottom plates to form a unitary section, telescopic ing a large and a small flue, respectively7 t with one pair of flues between the adjacent sections reverselyarranged relative to the pairs of largeand small flues between the next adjacent sections.

In testimony whereof l have signed my name to this specification. c

B. r. CALDWELL. 

